Abstract: In order to improve the uniaxial tensile property of ultra-high performance concrete (UHPC) with coarse aggregate, uniaxial tensile test and image analysis were employed to investigate the effects of dosage, maximum particle size of coarse aggregate on the tensile property of UHPC and steel fiber dispersion in the UHPC system, respectively. The experimental results showed that with the increase of dosage and particle size of coarse aggregate, the distribution coefficient and orientation coefficient of steel fiber in the UHPC systems were significantly decreased, resulting in the declines of tensile first cracking strength, post-cracking strength and energy absorption capacity of UHPC with coarse aggregate. Based on the matching relationship between maximum particle size of coarse aggregate and volume fraction and diameter of steel fiber (Dmax=3df/(Vf)0.5), the introduction of hybrid steel fibers can make full use of the hierarchical matching relationship between the multi-scale steel fibers and aggregates with different particle size distribution. The uniaxial tensile property of UHPC with coarse aggregate could be improved by the hybridization of straight steel fiber with 0.12 mm diameter, 10 mm length and 1.2% volume fraction and hooked-end steel fiber with 0.35 mm diameter, 20 mm length and 1.8% volume fraction when the volume fraction and maximum particle size of coarse aggregate were 10% and 10 mm, respectively. And the UHPC's tensile post-cracking strength and energy absorption capacity were 8.69 MPa and 11.10 J, respectively.
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2017, Vol. 31 
